Blackmer® BV Series bypass valves have no small, easily plugged, sensing passages; and with only two moving parts, their operation is simple and reliable. They open precisely at the pre-set spring pressure, and they close smoothly and quietly.

In operation, Blackmer valves provide exceptionally close pressure control, even under widely varying bypass flow conditions. The Blackmer valve maintains a virtually constant pressure of 100 psi (6.89 bar) even as the volume being bypassed rises from 10 GPM to 100 GPM

Dual purpose automatic priming and differential bypass valve. Allows vapor to return to the tank, keeping the line primed.

Chatter-free due to unique guide-piston design. Stainless steel piston and spring. All valves have 25-125 PSIG range.